班超
想要将录音带的声音输入计算机，必须有一条对录线。并将对录线的一端连接录音机的（）或（）插口，另一端则连接声卡的Line In插口。
自然界中分布最广，储藏量最大的煤是（）。 残植煤。 腐植煤。 腐泥煤。
钢常用的热处理方法有（）。 普通热处理。 表面热处理。 渗碳。 化学热处理。 碳氮共渗。
You have just created a new VLAN on your network for inter-VLAN routing. What is one step that you should include in your VLAN-based implementation and verification plan？（） Verify that different native VLANs exist between two switches for security purposes.。 Verify that the switch is configured to allow for trunking on the switch ports.。 Verify that each switch port has the proper IP address space assigned to it for the new VLAN. 。 Verify that the VLAN virtual interface has been correctly created and enabled.。
Which tech nology manages multicast traffic at Layer 2 by configuring Layer 2 LAN interfaces dynamically to forward multicast traffic only to those interfaces that want to receive it?（）
